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John Ogness e7c1fe2104 printk: ringbuffer: avoid memcpy() on state_var
@state_var is copied as part of the descriptor copying via
memcpy(). This is not allowed because @state_var is an atomic type,
which in some implementations may contain a spinlock.

Avoid using memcpy() with @state_var by explicitly copying the other
fields of the descriptor. @state_var is set using atomic set
operator before returning.

Fixes: b6cf8b3f33 ("printk: add lockless ringbuffer")
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200914094803.27365-2-john.ogness@linutronix.de
2020-09-15 14:42:09 +02:00
arch Kbuild fixes for v5.8 2020-06-21 12:44:52 -07:00
block
certs
crypto
Documentation scripts/gdb: update for lockless printk ringbuffer 2020-09-08 09:33:15 +02:00
drivers Pin control fixes for the v5.8 cycle, first take: 2020-06-21 13:04:57 -07:00
fs A few fixes and small cleanups for tracing: 2020-06-20 13:17:47 -07:00
include crash: add VMCOREINFO macro to define offset in a struct declared by typedef 2020-07-10 08:47:40 +02:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2020-09-08 09:33:15 +02:00
ipc
kernel printk: ringbuffer: avoid memcpy() on state_var 2020-09-15 14:42:09 +02:00
lib Kbuild fixes for v5.8 2020-06-21 12:44:52 -07:00
LICENSES
mm powerpc fixes for 5.8 #3 2020-06-21 10:02:53 -07:00
net
samples Kbuild fixes for v5.8 2020-06-21 12:44:52 -07:00
scripts scripts/gdb: update for lockless printk ringbuffer 2020-09-08 09:33:15 +02:00
security selinux/stable-5.8 PR 20200621 2020-06-21 15:41:24 -07:00
sound
tools A few fixes and small cleanups for tracing: 2020-06-20 13:17:47 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAIERS: Add John Ogness as printk reviewer 2020-07-15 08:49:12 +02:00
Makefile Linux 5.8-rc2 2020-06-21 15:45:29 -07:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.